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Environment-friendly calcium nitrate slow-release granule for remedying bottom mud of black and odorous river and preparation method of environment-friendly calcium nitrate slow-release granule

A technology of river sediment and slow-release particles, which is applied in the field of environmental restoration, can solve the problems of secondary pollution of sediment, nitrate nitrogen pollution, and low efficiency, and achieve the goal of reducing usage, alleviating black and odor pollution, and avoiding water pollution Effect

Active Publication Date: 2016-07-27
GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium nitrate is easily soluble in water, and it will be diluted and transported with the running water if it is directly put into the river, not only the efficiency is extremely low, but the unused nitrate may become nitrogen pollutants; and if hardened materials such as cement are used as buffer Release auxiliary materials will bring secondary pollution to the sediment

Method used

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  • Environment-friendly calcium nitrate slow-release granule for remedying bottom mud of black and odorous river and preparation method of environment-friendly calcium nitrate slow-release granule
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  • Environment-friendly calcium nitrate slow-release granule for remedying bottom mud of black and odorous river and preparation method of environment-friendly calcium nitrate slow-release granule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of special bottom mud: Collect 100g of bottom mud from clean river dredging into a 500mL beaker, add 100mL of 0.1M sodium nitrate solution, fully stir with a glass rod to make a slurry, let it stand at room temperature for one week, and pour out the supernatant liquid (the supernatant poured out can be used as the seed solution for the next batch of cultivation and used to prepare sodium nitrate solution) to obtain the denitrified bottom sludge, take the denitrified bottom sludge and dry it naturally, grind it into powder with a mortar, and pass through 100 mesh Sieve to obtain the air-dried denitrification bottom sludge, add activated carbon with a particle size less than 0.15mm to the air-dry denitrification bottom sludge in an amount of 5% of the mass of the air-dry denitrification bottom sludge, and mix to obtain a special bottom sludge;

[0034] (2) Three equal parts of calcium nitrate tetrahydrate (Ca(NO 3 ) 2 4H 2 O) Heating and melting in an ov...

Embodiment 2

[0039]Collect the bottom mud of the black and smelly polluted river, put it in a cylindrical glass tube (diameter 6.5cm), and naturally deposit it into a mud column with a height of about 10cm. Add river water with a height of about 20cm and stabilize it for a week to obtain the initial experimental mud column, as shown in figure 1 On; then get 2 (about 1.5g) of calcium nitrate slow-release granules obtained in Example 1 and add them into the experimental mud column as a treatment group, and set up a blank control group. , 8 days, monitor the phenotype of the mud phase, the height of the mud column, the thickness of the oxide layer, the oxidation-reduction potential (ORP) and the acid volatile sulfur (AVS, representing sulfide) content, as well as the dissolved oxygen (DO) and nitric acid in the water phase Root concentration and other indicators.

[0040] The measured results are as follows:

[0041] (1) After adding calcium nitrate slow-release granules to the experimental ...

Embodiment 3

[0047] (1) Preparation of special bottom mud: Collect 100g of bottom mud from clean river dredging into a 500mL beaker, add 100mL of 0.1M sodium nitrate solution, fully stir with a glass rod to make a slurry, let it stand at room temperature for one week, and pour out the supernatant liquid (the supernatant poured out can be used as the seed solution for the next batch of cultivation and used to prepare sodium nitrate solution) to obtain the denitrified bottom sludge, take the denitrified bottom sludge and dry it naturally, grind it into powder with a mortar, and pass through 100 mesh Sieve to obtain air-dried denitrification bottom sludge, add activated carbon with a particle size less than 0.15mm in an amount of 5% of the mass of air-dry denitrification bottom sludge and mix to obtain special bottom sludge;

[0048] (2) Calcium nitrate tetrahydrate (Ca(NO 3 ) 2 4H 2 O) Heating and melting in an oven at 50°C, adding 3 times the volume of water, fully stirring to obtain a ca...

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Abstract

The invention discloses an environment-friendly calcium nitrate slow-release granule for remedying bottom mud of a black and odorous river and a preparation method of the environment-friendly calcium nitrate slow-release granule. The environment-friendly calcium nitrate slow-release granule for remedying bottom mud of the black and odorous river takes the bottom mud as a remediation agent additive; firstly, a great amount of denitrification bacteria are enriched through denitrification modification, secondly, activated carbon is added, and together with polyving alcohol and sodium alginate as slow-release agents and sodium alginate as a coating material, the calcium nitrate slow-release granule can be prepared. The environment-friendly calcium nitrate slow-release granule is capable of effectively eliminating black and odorous pollution of the bottom mud, has characteristics of high efficiency and environment-friendliness, and has a great significance for city environment protection.

Description

technical field [0001] The invention belongs to the field of environmental restoration, and in particular relates to an environment-friendly calcium nitrate slow-release granule for repairing black and odorous river bottom mud and a preparation method thereof. Background technique: [0002] Urban rivers (rivers) are important resources for cities, and they perform functions such as landscape, drainage, transportation, and pollution. Since the reform and opening up, in the process of rapid social and economic development and urbanization in my country, urban rivers have been severely damaged and polluted, and black and odorous phenomena have appeared in large areas, which is far from the vision of "ecological living" and "civilized city". Repairing the black and odorous pollution of urban rivers has become an urgent task in our country. [0003] The reason for the black and odor pollution of the river course is that the river course accepts excessive organic pollutants for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06
CPCC02F11/06C02F2103/007
Inventor 杨旭楠潘汉平许玫英孙国萍
Owner GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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